BradJudy
07-03-2005, 02:27 PM
So, I'm sitting at home thinking 'I have a nice quite Sunday and nothing NEEDS to get done, so why not do some measurement?' A few weeks ago we had rearranged our family room (basically rotated it 90 degrees) and I hadn't done any measurements since. For reference, here was a measurement I made before rearranging the room:
http://www.bradjudy.com/AV123/ETF0phase.JPG
I whip out my trust ETF/ECM8000 combo and get to work. At first things are a bit odd because I had the receiver configured wrong for the front panel input. I can only set my crossover to 40 or 60Hz when using stereo mode on the analog inputs on my H/K, leaving me with some response issues (80Hz is best for my speakers). I switched to DPL II to get a 80 Hz crossover and measured this:
http://www.bradjudy.com/AV123/sub_and_mains_inroom_0phase.JPG
Ouch, that isn't pretty, but looks like at least a partially easy fix. Those who have spent time around crossovers (or out-of-phase drivers) will recognize the reverse null. So, I switched the phase on the sub from 0 to 180 and measured again:
http://www.bradjudy.com/AV123/sub_and_mains_inroom.JPG
Ding, my toast is done!! :D Forget the R-DES and/or room treatments I was considering before. Wrap up the measurement HW and kick back and enjoy.
Feel free to debate the impact that using DPLII had while taking these measurements. I'm going to enjoy the rest of the day. :)
(Cross-posted to AV123 forum - forgot to mention this is using a Hsu VTF-2 MkI).
http://www.bradjudy.com/AV123/ETF0phase.JPG
I whip out my trust ETF/ECM8000 combo and get to work. At first things are a bit odd because I had the receiver configured wrong for the front panel input. I can only set my crossover to 40 or 60Hz when using stereo mode on the analog inputs on my H/K, leaving me with some response issues (80Hz is best for my speakers). I switched to DPL II to get a 80 Hz crossover and measured this:
http://www.bradjudy.com/AV123/sub_and_mains_inroom_0phase.JPG
Ouch, that isn't pretty, but looks like at least a partially easy fix. Those who have spent time around crossovers (or out-of-phase drivers) will recognize the reverse null. So, I switched the phase on the sub from 0 to 180 and measured again:
http://www.bradjudy.com/AV123/sub_and_mains_inroom.JPG
Ding, my toast is done!! :D Forget the R-DES and/or room treatments I was considering before. Wrap up the measurement HW and kick back and enjoy.
Feel free to debate the impact that using DPLII had while taking these measurements. I'm going to enjoy the rest of the day. :)
(Cross-posted to AV123 forum - forgot to mention this is using a Hsu VTF-2 MkI).